King 2.5 Performance Shocks feature the finest materials in offroad shock craftsmanship, 100% built in the USA, custom built for your application. Using aluminum components, heat treated 2024 aluminum alloy pistons, and extremely high 100,000 psi tensile strength shafts which create the ultimate surface hardness against debris. The additional reservoir provides increased on road ride comfort and offroad capability through decreased operating pressures and increased heat dissipation, allowing you to tackle the most aggressive terrain.